1886. Superiority
Dwight had lived under Heaven and Earth's rule for a long time. He had seen experts rise until they almost reached the very peak of the cultivation journey, but he had also witnessed his leaders suppressing them without exception.
Many of those existences had earned the title of monster in their generation, but even their incredible power couldn't do anything once Heaven and Earth made up their mind to suppress them. It was a mere matter of available energy and expertise. A single expert couldn't compete with the vastness of the rulers.
Only unique existences could make the rulers struggle to achieve their seemingly inevitable victory. The monster outside the sky, the dragons, and the old Heaven and Earth were beings that came from greater powers, so getting rid of them would require far more than a single battle against perfect counters.